Update CI workflows to use setup actions: replace container definitions with setup-dotnet and setup-node actions for backend and frontend jobs, ensuring consistent environment configuration for builds and tests.

.gitea/workflows/build.yml

@@ -8,9 +8,11 @@ on:
 jobs:
   backend:
     runs-on: ubuntu-latest
-    container: mcr.microsoft.com/dotnet/sdk:10.0
     steps:
       - uses: actions/checkout@v4
+      - uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: 10.0.x
       - name: Restore
         working-directory: backend
         run: dotnet restore TeleWave.slnx
@@ -20,9 +22,11 @@ jobs:
 
   frontend:
     runs-on: ubuntu-latest
-    container: node:22
     steps:
       - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
       - name: Enable pnpm
         run: corepack enable
       - name: Install

.gitea/workflows/test.yml

@@ -8,11 +8,13 @@ on:
 jobs:
   backend-tests:
     runs-on: ubuntu-latest
-    container: mcr.microsoft.com/dotnet/sdk:10.0
     permissions:
       contents: write
     steps:
       - uses: actions/checkout@v4
+      - uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: 10.0.x
       - name: Restore
         working-directory: backend
         run: dotnet restore TeleWave.slnx